var imageArray=new Array();
var numImages = 0;

function loadImageArray(picnum,projectName)
{
	for (i=0; i<picnum; i++)
	{
		imageArray[i]=new Image();
		imageArray[i].src="images/"+projectName+(i+1)+".jpg";
	}
	numImages = picnum;
}

var curImage=0;
var nextImage=0;

function swapImage(direction)
{
	if (document.images)
	{
		if(direction == "NEXT")
		{
			nextImage=curImage+1;
			if (nextImage>=numImages)
				nextImage=0;
			if (nextImage == -1)
				nextImage = numImages-1;
		}else if(direction == "PREV"){
			nextImage=curImage-1;
			if (nextImage>=numImages)
				nextImage=0;
			if (nextImage == -1)
				nextImage = numImages-1;
		}else if(direction == ""){
				nextImage=0;
		}
    if (imageArray[nextImage] && imageArray[nextImage].complete)
    {
      var target=null;
      if (document.images.MainImage)
        target=document.images.MainImage;
      if (document.all && document.getElementById("MainImage"))
        target=document.getElementById("MainImage");

      target.src=imageArray[nextImage].src;
      curImage=nextImage;
    }
  }
}